Shallow cloning of Java objects

Shallow clone of/** * java object  *  when cloning an object, if the member variable of the object is the base type, a shallow clone is used to complete it.  *  if the object's member variable includes a mutable reference type, deep cloning is required  *  if the reference type is immutable, such as the string class, you do not have to deep clone  *  when you need to clone an object, you need to use clone () method, which replicates the various domains in the class, *  if there is a problem with the domain of the reference type, it becomes a shallow clone.  *  the class that provides the cloning function needs to implement the Cloneable interface, otherwise it throws an exception  */public class Address{private String  State;private string province;private string city;public address (String state,  string province, string city)  {this.state = state;this.province =  province;this.city = city;} Public string getstate ()  {return state;} Public void setstate (String state)  {this.state = state;} Public string getprovince ()  {return province;} Public void setprovince (string province)  {this.province = province;} Public string getcity ()  {return city;} Public void sEtcity (string city)  {this.city = city;} @Overridepublic  string tostring ()  {return  "address [state="  + state +   ",  province="  + province +  ",  city=" + city +  "]";}

Public class employee implements cloneable {private string name;private  int age;//New Address Object Private address address;public string getname ()  { Return name;} Public void setname (String name)  {this.name = name;} Public int getage ()  {return age;} Public void setage (Int age)  {this.age = age;} Public employee (string name, int age)  {this.name = name;this.age =  age;} Public employee (string name, int age, address address)  {this.name =  name;this.age = age;this.address = address;} Public address getaddress ()  {return address;} Public void setaddress (address address)  {this.address = address;} Public employee ()  {} @Overridepublic  string tostring ()  {return  "employee  [Name= " + name + ",  age= " + age + ",  address= "+ address  +  "]";} Implement the @overrideprotected employee clone ()  throws clonenotsupportedexception {of light cloning employee emp = null;try {emp =  (Employee)  super.clone ();}  catch  (clonenotsupportedexception e)  {e.printstacktrace ();} Return emp;}}

Test:

public class Testemployeeandaddress {public static void main (string[] args) throws Clonenotsupportedexception { System.out.println ("Before Cloning:"); Address address = new address ("China", "Jilin", "Changchun"); Employee EMP1 = new Employee ("Zhang xx", 30,address); SYSTEM.OUT.PRINTLN ("Employee 1 Information:" +EMP1); System.out.println ("After cloning:"); Employee emp2 = Emp1.clone (); Emp2.getaddress (). SetState ("China"); Emp2.getaddress (). Setprovince ("Sichuan"); emp2.getaddress (). Setcity ("Chengdu"); Emp2.setname ("Li xx"); Emp2.setage (24); SYSTEM.OUT.PRINTLN ("Employee 1 Information:" +EMP1); System.out.println ("Employee 2 Information:" +EMP2);}}

The results are as follows:

650) this.width=650; "src=" Https://s1.51cto.com/wyfs02/M01/8E/D7/wKioL1jMoyrjvs9ZAACRMGEbWPk435.jpg "title=" 36020170315204858576.jpg "alt=" Wkiol1jmoyrjvs9zaacrmgebwpk435.jpg "/>

This article is from the "It Rookie" blog, make sure to keep this source http://mazongfei.blog.51cto.com/3174958/1907844

Shallow cloning of Java objects